Even in today’s world, where a wealth of knowledge can be found with the click of a button, many people are still unaware of how damaging the effects of the sun can be. While everyone wants some fun in the sun, too much UV exposure causes skin deterioration and photo-aging; robbing skin of its youthful appearance and leading to unsightly pigment changes including red and brown spots.

Facial fillers are a common cosmetic treatment for wrinkles with low risk of ill-effects–in the hands of a skilled physician. Fillers such as Restylane, Perlane, Juvéderm, Voluma, or Boletera have become a great way to rejuvenate your face without surgery or downtime. However, when used incorrectly or in excess, clients are left looking over-volumized, like they’ve had their face unnaturally inflated in an attempt to remove all wrinkles.

This week, I was interviewed by the New York Times to weigh in on preservative systems and the shelf life of cosmetic products. Here’s what’s important to know: There is a difference between the shelf life and the use life of skin care products and it is important to recognize this difference when you buy them.